thank for the replies and bug reports. this is not easy to track – but matpe´s log shows that it might in fact be related to xray.jit.cellcoords.

i tried to shrink down the whole thing and came up with this little stress tester for jit.xray.cellcoords that crashes max quite easily ( mostly in a matter of seconds, i am on max 5.1.4, osx 10.6.8) ..

i´ll look where i can file a bugreport for the object – wesley, you here ?